fiddlecollector

Looks like maple to me. If it were beech i'd expect to see figure on more areas of the scroll than what you can see in the photos.

Its abeille

It could be but head looks odd.jtl bows like this often have routed mortices with the ends left round.

I always thought it was spirit varnish with a high sandarac content.

Yes thats it

Dowanol PM is just a brand name of Propylene Glycol Methyl Ether also known as 1 methoxy 2 propanol ,it is very useful for alsorts of things .Its boiling point (BP) is 120 centigrade. So it doesnt evaporate as fast as acetone . Its useful as a solvent to thin varnishes . G/Flex is the West system epoxy G/Flex 650. When i said easily removed i meant that it came off easily , actually dissolving epoxy is another thing . People have done tests letting epoxy sit in acetone for weeks and it didnt dissolve just went soft ,rubbery and crumbly.

There is quite a nasty chemical solvent for removing epoxy , but i was recently cleaning up some Gflex epoxy and found some was easily removed with dowanol PM after a week curing , it has quite a high BP so can be useful for soaking. I dont know if i was lucky but may be worth a try if you can get it. (methoxypropanol PM)

No Idea but read this recent thread. https://maestronet.com/forum/index.php?/topic/363964-canada-and-tariffs/

The handwritting appears to say the same maker johann Gottlieb etc.

Beuscher shop is still around , i believe most of their violin related stuff is from Laberte or JTL etc... they were founded by an Accordian maker. Instrument in question is probably from Laberte.

Why do they do their own now?? I havent used them (tarisio) since before Covid.

Yes i suppose, ive since used a split aircon on heating mode when i need to use hide glue.

I had never heard of that hide glue. It is probably just a mixture of sitting around in storage and your climate like you hinted at ,i believe San Antonio is in Texas ,if so then a complete difference in climate to me as i live in probably the wettest part of England. I have a cello back joined like yours in storage and i wouldnt be surprised if the joint in it has gone the same way but i havent looked at it for years.. I always had a problem of getting cello backs and fronts joined before gelling due to low temperature climate. I think also its simply due to the size of cello plates compared to violins, alot bigger and probably more movement with climate changes.

I would have used a higher bloom strength glue for a cello back joint, most seem to use 190 or higher . 140 may be ok for glue the plates to the ribs. Did you use a perfectly flat straight joint or slight hollowing?

Nice colour, so it didnt produce its own craquelure ,i cant see any break in the colour on the bottom photo?